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The KY-28 was an analog, voice encryption device based on transistor circuitry
It was classified when loaded with codes, It was not allowed to photograph in aircraft.
the KYK-38 was used to input the key set. Surrounded by a clamshell cover, it contained rows of pins corresponding to the rows of small holes on the front of the KY-28. It was keyed through a small coverplate, that when opened, exposed a number of holes. A key charging device was used that was comprised of slide stops on a series of rods and a cam mechanisim to force the rods out to the distance set by the slide stops against spring pressure. The rods would penetrate the holes and set permuter contacts according to the depth of penetration. It took a lot of pressure to load a key set. A zeroize pin was activated by closing the cover, such that opening the cover again would zeroize the permuter settings, which would also render the equipment incapable of passing an alarm check and passing to operating mode. For aircraft operation, the policy was to wire the door shut using safety wire before the aircraft was cleared for flight.
The charging device was set according to a distributed and classified key list. The KY-28 equipment was owned by individual services and held the classification of the keys when loaded.
I worked on them and loaded the keys back in the day.
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